NeuralSynth/Source/PluginProcessor.cpp

/*
  ==============================================================================

    This file contains the basic framework code for a JUCE plugin processor.

  ==============================================================================
*/

#include "PluginProcessor.h"
#include "PluginEditor.h"

//==============================================================================
NeuralSynthAudioProcessor::NeuralSynthAudioProcessor() : parameters(*this, nullptr, "PARAMETERS", createParameterLayout())
     , AudioProcessor(BusesProperties().withOutput("Output", juce::AudioChannelSet::stereo(), true))
    , audioEngine(sp)
{
    parameters.addParameterListener("waveform", this);

    parameters.addParameterListener("attack", this);
    parameters.addParameterListener("decay", this);
    parameters.addParameterListener("sustain", this);
    parameters.addParameterListener("release", this);

    sp.attack = parameters.getRawParameterValue("attack");
    sp.decay = parameters.getRawParameterValue("decay");
    sp.sustain = parameters.getRawParameterValue("sustain");
    sp.release = parameters.getRawParameterValue("release");
}

NeuralSynthAudioProcessor::~NeuralSynthAudioProcessor()
{
}

//==============================================================================
const juce::String NeuralSynthAudioProcessor::getName() const
{
    return JucePlugin_Name;
}

bool NeuralSynthAudioProcessor::acceptsMidi() const
{
   #if JucePlugin_WantsMidiInput
    return true;
   #else
    return false;
   #endif
}

bool NeuralSynthAudioProcessor::producesMidi() const
{
   #if JucePlugin_ProducesMidiOutput
    return true;
   #else
    return false;
   #endif
}

bool NeuralSynthAudioProcessor::isMidiEffect() const
{
   #if JucePlugin_IsMidiEffect
    return true;
   #else
    return false;
   #endif
}

double NeuralSynthAudioProcessor::getTailLengthSeconds() const
{
    return 0.0;
}

int NeuralSynthAudioProcessor::getNumPrograms()
{
    return 1;   // NB: some hosts don't cope very well if you tell them there are 0 programs,
                // so this should be at least 1, even if you're not really implementing programs.
}

int NeuralSynthAudioProcessor::getCurrentProgram()
{
    return 0;
}

void NeuralSynthAudioProcessor::setCurrentProgram (int index)
{
}

const juce::String NeuralSynthAudioProcessor::getProgramName (int index)
{
    return {};
}

void NeuralSynthAudioProcessor::changeProgramName (int index, const juce::String& newName)
{
}

//==============================================================================
void NeuralSynthAudioProcessor::prepareToPlay (double sampleRate, int samplesPerBlock)
{
    audioEngine.prepare({ sampleRate, (juce::uint32)samplesPerBlock, 2 });
    midiMessageCollector.reset(sampleRate);
}

void NeuralSynthAudioProcessor::releaseResources()
{
    // When playback stops, you can use this as an opportunity to free up any
    // spare memory, etc.
}

bool NeuralSynthAudioProcessor::isBusesLayoutSupported (const BusesLayout& layouts) const
{
    // This is the place where you check if the layout is supported.
    // In this template code we only support mono or stereo.
    if (layouts.getMainOutputChannelSet() != juce::AudioChannelSet::mono()
        && layouts.getMainOutputChannelSet() != juce::AudioChannelSet::stereo())
        return false;

    return true;
}

void NeuralSynthAudioProcessor::processBlock(juce::AudioSampleBuffer& buffer, juce::MidiBuffer& midiMessages)
{
    const int newWaveform = sp.waveform.exchange(-1);

    if (newWaveform != -1) {
        audioEngine.applyToVoices([newWaveform](NeuralSynthVoice* v)
            {
                v->changeWaveform(newWaveform);
            });
    }

    juce::ScopedNoDenormals noDenormals;
    auto totalNumInputChannels = getTotalNumInputChannels();
    auto totalNumOutputChannels = getTotalNumOutputChannels();

    midiMessageCollector.removeNextBlockOfMessages(midiMessages, buffer.getNumSamples());

    for (int i = totalNumInputChannels; i < totalNumOutputChannels; ++i)
        buffer.clear(i, 0, buffer.getNumSamples());

    audioEngine.renderNextBlock(buffer, midiMessages, 0, buffer.getNumSamples());
    scopeDataCollector.process(buffer.getReadPointer(0), (size_t)buffer.getNumSamples());
}

//==============================================================================
bool NeuralSynthAudioProcessor::hasEditor() const
{
    return true; // (change this to false if you choose to not supply an editor)
}

juce::AudioProcessorEditor* NeuralSynthAudioProcessor::createEditor()
{
    return new NeuralSynthAudioProcessorEditor (*this);
}

//==============================================================================
void NeuralSynthAudioProcessor::getStateInformation (juce::MemoryBlock& destData)
{
    // You should use this method to store your parameters in the memory block.
    // You could do that either as raw data, or use the XML or ValueTree classes
    // as intermediaries to make it easy to save and load complex data.
}

void NeuralSynthAudioProcessor::setStateInformation (const void* data, int sizeInBytes)
{
    // You should use this method to restore your parameters from this memory block,
    // whose contents will have been created by the getStateInformation() call.
}

void NeuralSynthAudioProcessor::parameterChanged(const juce::String& id, float newValue)
{
    if (id == "waveform")
        sp.waveform.store((int)newValue, std::memory_order_release);
}

//==============================================================================
// This creates new instances of the plugin..
juce::AudioProcessor* JUCE_CALLTYPE createPluginFilter()
{
    return new NeuralSynthAudioProcessor();
}

juce::AudioProcessorValueTreeState::ParameterLayout NeuralSynthAudioProcessor::createParameterLayout()
{
    std::vector<std::unique_ptr<juce::RangedAudioParameter>> params;

    params.push_back(std::make_unique<juce::AudioParameterChoice>(
        "waveform", "Waveform",
        juce::StringArray{ "Sine", "Saw", "Square", "Triangle" }, 0));

    // Start/end/interval
    params.push_back(std::make_unique<juce::AudioParameterFloat>("attack", "Attack",
        juce::NormalisableRange<float>(0.0f, 1.0f, 0.01f), 0.1f));
    params.push_back(std::make_unique<juce::AudioParameterFloat>("decay", "Decay",
        juce::NormalisableRange<float>(0.0f, 1.0f, 0.01f), 0.5f));
    params.push_back(std::make_unique<juce::AudioParameterFloat>("sustain", "Sustain",
        juce::NormalisableRange<float>(0.0f, 1.0f, 0.01f), 0.8f));
    params.push_back(std::make_unique<juce::AudioParameterFloat>("release", "Release",
        juce::NormalisableRange<float>(0.01f, 1.0f, 0.01f), 1.0f));

    return { params.begin(), params.end() };
}